最新Gambit 中建立几何模型的方法教学讲义PPT课件.ppt

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1、Gambit中建立几何模型的方法OutlinePreliminariesGeneraloperationsReal(ACIS)geometryBottom-upcreationtoolsTop-downcreationtoolsFacePrimitivesVolumePrimitivesBooleanandSplitOperationsPreliminaries-1Objective:Createandmeshthefluidregionforflowproblemsandsolidregionsforheattransfer(and

2、structrualanalysisforFidapUsers).Typicallyaccomplishedbyconstructingandworkingwithlowerorderentityobjectsandvolumeprimitives.Terminology:Vertex-apointEdge-acurvethatisdefinedbyatleast2verticesFace-asurface(notnecessarilyplanar)boundedbyatleast1edge(inthecaseof1edge,thee

3、dgeformsaloop)Volume-ageometricsolid(asinasolidsmodel),alsocanbethoughtofasan“airtight”setofboundingfaces.GeneralOperations:VectorDefinitionFormVectorDefinitionformAccessiblefrom:RotateandReflect(inMove/Copy)SweepandRevolve(inFace/VolumeCreate)ViewFace/VectorMethods:Coo

4、rdinatesystemaxis:UsestheunitvectorsTwoexistingverticesAnexistingEdgeTwopointsdefinedbycoordinatesGeneralOperations:AlignAlignAlignisanalternativetoMove-translate(+rotate).ItusesverticesonthestartandfinalpositiontomovetheobjectMethodofincreasedalignmentwiththeuseofverte

5、x-pairsConnectedgeometrycanbeincludedRotationPlanealignmentTranslation++++++++++331122GeneralOperations:ConnectConnect(Real)Vertices,EdgesandFacescanbeconnectedTheoperationeliminatesallduplicateentitiesandreconnectsuppertopologyIndividualand“All”pickingavailableOnlyenti

6、tieswithintheACIStolerancewillbeconnectedImportantfunctionalitywhenusingCopy-creationorfordisconnectedBooleanoperationConnectEdgesCopy+TranslateTwoEdgesOneEdgeOneFaceGeneralOperations:DisconnectDisconnect(Real)Vertices,EdgesandFacescanbedisconnectedTheoperationrecreates

7、duplicateentitiesandreconnectsuppertopologySeveraloptionsexistsDisconnectTwoEdgesOneEdgeEdge+VerticesGeneralOperations:DeleteDeleteDefaultdeletesgeometryandlowergeometry.Optiontokeeplowergeometry(e.g.,deletefacebutsaveedges)GeneralOperations:Misc.Summarize/Query/TotalSu

8、mmaryofvertexcoordinates,lowertopology,meshinformation,element/nodelabels,etc.ChecksforvalidACISgeometryQuery: